<?php
////////////////////////////////////////////////////
// SMTP - PHP SMTP class
//
// Version 1.02
//
// Define an SMTP class that can be used to connect
// and communicate with any SMTP server. It implements
// all the SMTP functions defined in RFC821 except TURN.
//
// Author: Chris Ryan
//
// License: LGPL, see LICENSE
////////////////////////////////////////////////////

/**
* SMTP is rfc 821 compliant and implements all the rfc 821 SMTP
* commands except TURN which will always return a not implemented
* error. SMTP also provides some utility methods for sending mail
* to an SMTP server.
* @package PHPMailer
* @author Chris Ryan
*/
class SMTP
{
/**
* SMTP server port
* @var int
*/
var $SMTP_PORT = 25;

/**
* SMTP reply line ending
* @var string
*/
var $CRLF = " ";

/**
* Sets whether debugging is turned on
* @var bool
*/
var $do_debug; # the level of debug to perform

/**#@+
* @access private
*/
var $smtp_conn; # the socket to the server
var $error; # error if any on the last call
var $helo_rply; # the reply the server sent to us for HELO
/**#@-*/

/**
* Initialize the class so that the data is in a known state.
* @access public
* @return void
*/
function SMTP() {
$this->smtp_conn = 0;
$this->error = null;
$this->helo_rply = null;

$this->do_debug = 0;
}

/*************************************************************
* CONNECTION FUNCTIONS *
***********************************************************/

/**
* Connect to the server specified on the port specified.
* If the port is not specified use the default SMTP_PORT.
* If tval is specified then a connection will try and be
* established with the server for that number of seconds.
* If tval is not specified the default is 30 seconds to
* try on the connection.
*
* SMTP CODE SUCCESS: 220
* SMTP CODE FAILURE: 421
* @access public
* @return bool
*/
function Connect($host,$port=0,$tval=30) {
# set the error val to null so there is no confusion
$this->error = null;

# make sure we are __not__ connected
if($this->connected()) {
# ok we are connected! what should we do?
# for now we will just give an error saying we
# are already connected
$this->error =
array("error" => "Already connected to a server");
return false;
}

if(empty($port)) {
$port = $this->SMTP_PORT;
}

#connect to the smtp server
$this->smtp_conn = fsockopen($host, # the host of the server
$port, # the port to use
$errno, # error number if any
$errstr, # error message if any
$tval); # give up after ? secs
# verify we connected properly
if(empty($this->smtp_conn)) {
$this->error = array("error" => "Failed to connect to server",
"errno" => $errno,
"errstr" => $errstr);
if($this->do_debug >= 1) {
echo "SMTP -> ERROR: " . $this->error["error"] .
": $errstr ($errno)" . $this->CRLF;
}
return false;
}

# sometimes the SMTP server takes a little longer to respond
# so we will give it a longer timeout for the first read
// Windows still does not have support for this timeout function
if(substr(PHP_OS, 0, 3) != "WIN")
socket_set_timeout($this->smtp_conn, $tval, 0);

# get any announcement stuff
$announce = $this->get_lines();

# set the timeout of any socket functions at 1/10 of a second
//if(function_exists("socket_set_timeout"))
// socket_set_timeout($this->smtp_conn, 0, 100000);

if($this->do_debug >= 2) {
echo "SMTP -> FROM SERVER:" . $this->CRLF . $announce;
}

return true;
}

/**
* Performs SMTP authentication. Must be run after running the
* Hello() method. Returns true if successfully authenticated.
* @access public
* @return bool
*/
function Authenticate($username, $password) {
// Start authentication
fputs($this->smtp_conn,"AUTH LOGIN" . $this->CRLF);

$rply = $this->get_lines();
$code = substr($rply,0,3);

if($code != 334) {
$this->error =
array("error" => "AUTH not accepted from server",
"smtp_code" => $code,
"smtp_msg" => substr($rply,4));
if($this->do_debug >= 1) {
echo "SMTP -> ERROR: " . $this->error["error"] .
": " . $rply . $this->CRLF;
}
return false;
}

// Send encoded username
fputs($this->smtp_conn, base64_encode($username) . $this->CRLF);

$rply = $this->get_lines();
$code = substr($rply,0,3);

if($code != 334) {
$this->error =
array("error" => "Username not accepted from server",
"smtp_code" => $code,
"smtp_msg" => substr($rply,4));
if($this->do_debug >= 1) {
echo "SMTP -> ERROR: " . $this->error["error"] .
": " . $rply . $this->CRLF;
}
return false;
}

// Send encoded password
fputs($this->smtp_conn, base64_encode($password) . $this->CRLF);

$rply = $this->get_lines();
$code = substr($rply,0,3);

if($code != 235) {
$this->error =
array("error" => "Password not accepted from server",
"smtp_code" => $code,
"smtp_msg" => substr($rply,4));
if($this->do_debug >= 1) {
echo "SMTP -> ERROR: " . $this->error["error"] .
": " . $rply . $this->CRLF;
}
return false;
}

return true;
}

/**
* Returns true if connected to a server otherwise false
* @access private
* @return bool
*/
function Connected() {
if(!empty($this->smtp_conn)) {
$sock_status = socket_get_status($this->smtp_conn);
if($sock_status["eof"]) {
# hmm this is an odd situation... the socket is
# valid but we aren't connected anymore
if($this->do_debug >= 1) {
echo "SMTP -> NOTICE:" . $this->CRLF .
"EOF caught while checking if connected";
}
$this->Close();
return false;
}
return true; # everything looks good
}
return false;
}

/**
* Closes the socket and cleans up the state of the class.
* It is not considered good to use this function without
* first trying to use QUIT.
* @access public
* @return void
*/
function Close() {
$this->error = null; # so there is no confusion
$this->helo_rply = null;
if(!empty($this->smtp_conn)) {
# close the connection and cleanup
fclose($this->smtp_conn);
$this->smtp_conn = 0;
}
}


/***************************************************************
* SMTP COMMANDS *
*************************************************************/

/**
* Issues a data command and sends the msg_data to the server
* finializing the mail transaction. $msg_data is the message
* that is to be send with the headers. Each header needs to be
* on a single line followed by a <CRLF> with the message headers
* and the message body being seperated by and additional <CRLF>.
*
* Implements rfc 821: DATA <CRLF>
*
* SMTP CODE INTERMEDIATE: 354
* [data]
* <CRLF>.<CRLF>
* SMTP CODE SUCCESS: 250
* SMTP CODE FAILURE: 552,554,451,452
* SMTP CODE FAILURE: 451,554
* SMTP CODE ERROR : 500,501,503,421
* @access public
* @return bool
*/
function Data($msg_data) {
$this->error = null; # so no confusion is caused

if(!$this->connected()) {
$this->error = array(
"error" => "Called Data() without being connected");
return false;
}

fputs($this->smtp_conn,"DATA" . $this->CRLF);

$rply = $this->get_lines();
$code = substr($rply,0,3);

if($this->do_debug >= 2) {
echo "SMTP -> FROM SERVER:" . $this->CRLF . $rply;
}

if($code != 354) {
$this->error =
array("error" => "DATA command not accepted from server",
"smtp_code" => $code,
"smtp_msg" => substr($rply,4));
if($this->do_debug >= 1) {
echo "SMTP -> ERROR: " . $this->error["error"] .
": " . $rply . $this->CRLF;
}
return false;
}

# the server is ready to accept data!
# according to rfc 821 we should not send more than 1000
# including the CRLF
# characters on a single line so we will break the data up
# into lines by and/or then if needed we will break
# each of those into smaller lines to fit within the limit.
# in addition we will be looking for lines that start with
# a period '.' and append and additional period '.' to that
# line. NOTE: this does not count towards are limit.

# normalize the line breaks so we know the explode works
$msg_data = str_replace(" "," ",$msg_data);
$msg_data = str_replace(" "," ",$msg_data);
$lines = explode(" ",$msg_data);

# we need to find a good way to determine is headers are
# in the msg_data or if it is a straight msg body
# currently I'm assuming rfc 822 definitions of msg headers
# and if the first field of the first line (':' sperated)
# does not contain a space then it _should_ be a header
# and we can process all lines before a blank "" line as
# headers.
$field = substr($lines[0],0,strpos($lines[0],":"));
$in_headers = false;
if(!empty($field) && !strstr($field," ")) {
$in_headers = true;
}

$max_line_length = 998; # used below; set here for ease in change

while(list(,$line) = @each($lines)) {
$lines_out = null;
if($line == "" && $in_headers) {
$in_headers = false;
}
# ok we need to break this line up into several
# smaller lines
while(strlen($line) > $max_line_length) {
$pos = strrpos(substr($line,0,$max_line_length)," ");

# Patch to fix DOS attack
if(!$pos) {
$pos = $max_line_length - 1;
}

$lines_out[] = substr($line,0,$pos);
$line = substr($line,$pos + 1);
# if we are processing headers we need to
# add a LWSP-char to the front of the new line
# rfc 822 on long msg headers
if($in_headers) {
$line = " " . $line;
}
}
$lines_out[] = $line;

# now send the lines to the server
while(list(,$line_out) = @each($lines_out)) {
if(strlen($line_out) > 0)
{
if(substr($line_out, 0, 1) == ".") {
$line_out = "." . $line_out;
}
}
fputs($this->smtp_conn,$line_out . $this->CRLF);
}
}

# ok all the message data has been sent so lets get this
# over with aleady
fputs($this->smtp_conn, $this->CRLF . "." . $this->CRLF);

$rply = $this->get_lines();
$code = substr($rply,0,3);

if($this->do_debug >= 2) {
echo "SMTP -> FROM SERVER:" . $this->CRLF . $rply;
}

if($code != 250) {
$this->error =
array("error" => "DATA not accepted from server",
"smtp_code" => $code,
"smtp_msg" => substr($rply,4));
if($this->do_debug >= 1) {
echo "SMTP -> ERROR: " . $this->error["error"] .
": " . $rply . $this->CRLF;
}
return false;
}
return true;
}

/**
* Expand takes the name and asks the server to list all the
* people who are members of the _list_. Expand will return
* back and array of the result or false if an error occurs.
* Each value in the array returned has the format of:
* [ <full-name> <sp> ] <path>
* The definition of <path> is defined in rfc 821
*
* Implements rfc 821: EXPN <SP> <string> <CRLF>
*
* SMTP CODE SUCCESS: 250
* SMTP CODE FAILURE: 550
* SMTP CODE ERROR : 500,501,502,504,421
* @access public
* @return string array
*/
function Expand($name) {
$this->error = null; # so no confusion is caused

if(!$this->connected()) {
$this->error = array(
"error" => "Called Expand() without being connected");
return false;
}

fputs($this->smtp_conn,"EXPN " . $name . $this->CRLF);

$rply = $this->get_lines();
$code = substr($rply,0,3);

if($this->do_debug >= 2) {
echo "SMTP -> FROM SERVER:" . $this->CRLF . $rply;
}

if($code != 250) {
$this->error =
array("error" => "EXPN not accepted from server",
"smtp_code" => $code,
"smtp_msg" => substr($rply,4));
if($this->do_debug >= 1) {
echo "SMTP -> ERROR: " . $this->error["error"] .
": " . $rply . $this->CRLF;
}
return false;
}

# parse the reply and place in our array to return to user
$entries = explode($this->CRLF,$rply);
while(list(,$l) = @each($entries)) {
$list[] = substr($l,4);
}

return $list;
}

/**
* Sends the HELO command to the smtp server.
* This makes sure that we and the server are in
* the same known state.
*
* Implements from rfc 821: HELO <SP> <domain> <CRLF>
*
* SMTP CODE SUCCESS: 250
* SMTP CODE ERROR : 500, 501, 504, 421
* @access public
* @return bool
*/
function Hello($host="") {
$this->error = null; # so no confusion is caused

if(!$this->connected()) {
$this->error = array(
"error" => "Called Hello() without being connected");
return false;
}

# if a hostname for the HELO wasn't specified determine
# a suitable one to send
if(empty($host)) {
# we need to determine some sort of appopiate default
# to send to the server
$host = "localhost";
}

// Send extended hello first (RFC 2821)
if(!$this->SendHello("EHLO", $host))
{
if(!$this->SendHello("HELO", $host))
return false;
}

return true;
}

/**
* Sends a HELO/EHLO command.
* @access private
* @return bool
*/
function SendHello($hello, $host) {
fputs($this->smtp_conn, $hello . " " . $host . $this->CRLF);

$rply = $this->get_lines();
$code = substr($rply,0,3);

if($this->do_debug >= 2) {
echo "SMTP -> FROM SERVER: " . $this->CRLF . $rply;
}

if($code != 250) {
$this->error =
array("error" => $hello . " not accepted from server",
"smtp_code" => $code,
"smtp_msg" => substr($rply,4));
if($this->do_debug >= 1) {
echo "SMTP -> ERROR: " . $this->error["error"] .
": " . $rply . $this->CRLF;
}
return false;
}

$this->helo_rply = $rply;

return true;
}

/**
* Gets help information on the keyword specified. If the keyword
* is not specified then returns generic help, ussually contianing
* A list of keywords that help is available on. This function
* returns the results back to the user. It is up to the user to
* handle the returned data. If an error occurs then false is
* returned with $this->error set appropiately.
*
* Implements rfc 821: HELP [ <SP> <string> ] <CRLF>
*
* SMTP CODE SUCCESS: 211,214
* SMTP CODE ERROR : 500,501,502,504,421
* @access public
* @return string
*/
function Help($keyword="") {
$this->error = null; # to avoid confusion

if(!$this->connected()) {
$this->error = array(
"error" => "Called Help() without being connected");
return false;
}

$extra = "";
if(!empty($keyword)) {
$extra = " " . $keyword;
}

fputs($this->smtp_conn,"HELP" . $extra . $this->CRLF);

$rply = $this->get_lines();
$code = substr($rply,0,3);

if($this->do_debug >= 2) {
echo "SMTP -> FROM SERVER:" . $this->CRLF . $rply;
}

if($code != 211 && $code != 214) {
$this->error =
array("error" => "HELP not accepted from server",
"smtp_code" => $code,
"smtp_msg" => substr($rply,4));
if($this->do_debug >= 1) {
echo "SMTP -> ERROR: " . $this->error["error"] .
": " . $rply . $this->CRLF;
}
return false;
}

return $rply;
}

/**
* Starts a mail transaction from the email address specified in
* $from. Returns true if successful or false otherwise. If True
* the mail transaction is started and then one or more Recipient
* commands may be called followed by a Data command.
*
* Implements rfc 821: MAIL <SP> FROM:<reverse-path> <CRLF>
*
* SMTP CODE SUCCESS: 250
* SMTP CODE SUCCESS: 552,451,452
* SMTP CODE SUCCESS: 500,501,421
* @access public
* @return bool
*/
function Mail($from) {
$this->error = null; # so no confusion is caused

if(!$this->connected()) {
$this->error = array(
"error" => "Called Mail() without being connected");
return false;
}

fputs($this->smtp_conn,"MAIL FROM:<" . $from . ">" . $this->CRLF);

$rply = $this->get_lines();
$code = substr($rply,0,3);

if($this->do_debug >= 2) {
echo "SMTP -> FROM SERVER:" . $this->CRLF . $rply;
}

if($code != 250) {
$this->error =
array("error